Social isolation with the narcissist is a hostage situation: intermittent reinforcement leads to trauma bonding and the Stockholm Syndrome.
The pandemic challenges the narcissist's grandiosity. The narcissist displaces his need for control onto his spouse or intimate partner.
It is difficult to obtain scarce narcissistic supply in a pandemic, so the narcissist reverts to his partner and when she frustrates his insatiable appetite, he becomes aggressive: sexually demanding or withholding, physically violent, verbally and psychologically abusive, gives her the silent treatment and even threatens her.
"Background Noise" is the only technique that works in these circumstances.
Abuse and abusive relationships with narcissists and psychopaths